The Viper is a 2800MHz Patriot

It is rather hard to get excited about DDR4 memory as it does not seem to offer much of an improvement over DDR3 nor is it affordable. On the other had it is the only way to get Quad channel performance out of your X99 board and it is more power efficient. The 16GB Patriot DDR4-2800MHz kit will set you back at least $300 and can run at either DDR4-2800MHz @ 16-18-18-36 or DDR4-2133MHz @ 15-15-15-36. In testing Bjorn3D saw improvements in synthetic benchmarks such as AIDA64 and Sandra but little difference in gameplay performance. Still if you are going to buy a Haswell E i7-5930k you are going to need some sort of DDR4 and this kit did hold up to the competition.

"Founded in 1985, Patriot designs, manufactures and markets high performance, enthusiast memory modules, flash memory, and mobile accessory products with the objective of offering a perfect blend of quality and value for consumers. Happy 30th Patriot! Patriots long tradition of enthusiast ram modules is continued in their Viper 4 Series, DDR4 16GB 2800MHz kit. The Viper 4 2800MHz kit is timed at 16-18-18-36 and should be plug and play with Intels’ XMP profile technology."